Reinforcement for wooden keels and keelsons



R. OGAWA. REINFORCEMENT FOR WOODEN KEELS AND KEELSONS.

APPLICATION FILED OCT- 9; I919.

Patented Aug. 3 1920.

am umfoz have invented certain new UNITED STATES PATENT orr cs.

BIOHEI OGAWA, OE TOKYO,

REINFORCEMENT FOR Application filed October To all whom it may concern:

Be it known that I, RIOHEI OGAWA, a subject of the Emperor of Japan, residing at No. 22 Tatsuokacho, Hongokn, Tokyo, Japan,

an useful. Im- Reinforcements for Wooden provements in the following Keels and Keelsons, of which is a specification.

This invention relates to reinforcements for wooden keels and keelsons in the form of a composite longitudinal girder fastened with bolts driven through floor timbers, and consisting of metallic plates or sectors attached, on the top the rider-keelson, of the keel or the lower keel, and

timbers. v

The object of the invention is to provide an apparatus of the above character which increases the longitudinal and local strength economically and at the same time the stow age capacity. I

For a clearer comprehension of the invention attention is invited to the accompanying drawings, forming a part of this specification, in which- 7 Figure 1 is the cross sectional view of the apparatus and Fig. 2 is the longitudinal under the bottom surface the said sectional view of the same.

' by bolts driven the following disadvantages :-Inside In all of the above views corresponding parts are represented by identical figures of reference. I

For a wooden ship, it is common practice the numbers of to increase the scantlings or the keelson, rider-keelson, sister-keelson or keel to obtain greater longitudinal and local strength against the weight of cargo strength and machinery, as the strengthening of the main longitudinal timbers at the center line of the ship is most efficient.

But the huge longitudinal timbers indufie t e ship, the diminution of the stowage capacity, the complication of the fastening, the conflict in the machinery setting; and outside the ship, the diminution of the speed, and the increase of the draft.

Free from all of the above disadvantages, this invention is designed to be an efiicient, economical, and novel means to form a composite longitudinal girder fastened rigidly through the center longitudinal timbers. The metallic plates forming a part of the composite girder are to be WOODEN KEELS Specification Letters Patent.

surface of the keelson or vent water leakage and JA?AN.

AND xnnnsons.

Patented Aug. 3,1920.

9, 1919. Serial No. 329,578.

attached fairly on the inside top surface and the outside bottom surface of the center longitudinal timbers.

The metallic plate or section is attached fairly on the top surface of the keelson or the rider-keelson, and the metallic plate 2, is attached under the bottom surface of the keel or the lower keel, and these plates are to be continued by the lap or butt strapped joint when they consist of two or more pieces; the fastening bolts 3 are to be nutted or clenched and. driven through from the under surface of the plate 2 to the top surface of the plate 1 at suitable points through the floor timbers. WVhen only one of the metallic plates 1 or 2 is used, the proper washers for bolts are to be fitted on the exposed wood surface. The falsekeel or shoe 4 is to be fitted properly to cover the metallic plate 2 and the fastening bolts 3 so as to preof the metallic sheathing.

For example, plied to a wooden ship whose keel and keelson are 15 inches square teak and the floor timbers 15 inches deep, the strength increase may be obtained two and a half times that of the original by the two steel tie plates,

. desirably inches in width and inch in thickness, the plates being secured by a number of fastening bolts. To obtain the same strength increase by the additional longitudinal timbers, six inside longitudinals, five of which are added, and which are each inches square teak are fitted in a prismatic shape (one on the top, two in the middle, three in the bottom) and suitably fastened to the keel. 7

As is to be understood in the present case one cubic inch of the steel plate matches for 75 cubic inchesof the teak and increases the cargo capacity 7.7,6 cubic feet for every foot of ships length and saves the ships weight 37 9 lbs. for every foot of ships length and at the same time one-fourth of the fastening bolts will be enough to obtain the simple, rigid, and strong composite girder.

Claims:

1. A reinforcement for wooden keels and keelsons including metallic plates secured to the upper surface of the keelson and. the under surface of the keel.

' 2. A reinforcement for wooden keels and the galvanic action.

when this invention is ap-' keelsons including plates arranged respectively against the upper surface of the keelson and the under surface of the keel, and means passing through the keelson and the V keel for fastening the plates in position.

3. An apparatus as claimed in claim 2 wherein the fastening means consists of elongated bolts passing through the keelson and the keel and nuts embracing the free RI OHEI OGAWA.

' Witnesses: i P

G. ARoIL As, T. KANEUOH. 

